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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6a53277ef44e8df1bd33f051f61799f1038a0e4c59d4c803d0b0364c9d5985' 
  AND token = 'gYff5XG6FSY20omly/iO8vaEWiqJCPcyf21bzWkiddo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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