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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a6f826f995a89d4dd9e50ce467cbf9010c426e77f4a2fec90e551e2db505e7' 
  AND token = 'BGalxfwFIdulLwqrYtb9UJoThmbexSYpKqjsvBJw9Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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