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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894d884ad4b05756662d7914914af1398e0aa278e6332006335be23c8ddb95d4' 
  AND token = 'lb0d17BpLf34UNu2MneFRiKwWl9mxdkDLa4sfJj+C6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}