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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36d5bc2504c6e915f9af35facf6aced0d8fc9637124f8f6b3534dbb74ab3cd8' 
  AND token = '1AH4UmB/EwF0jk+fuaLlqf4w3WazldaqpbEk7JnNSQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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