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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5512b9ec1578c4344260557d1e120a0c63ace5472853c6854c2cffa18f1ab7bc' 
  AND token = '1BL8HD5lc795ne8ApU7KuURtNRHS31xyH0AvO3eaV/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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