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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17ff6170805afe3575125933eb2926180276e5c10556f490fd22c50093021cf' 
  AND token = '2+b5GpKZUXB1b89ZzNPIBXN2RihN04aY4QVUS//5qp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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