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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b7576f1ddb6cf98aab7eb83e6b6632a017fd5b233886b100a4a9dbfc768193' 
  AND token = '+golOB6KxIJFqyF7Ee5R2QDZ78SVN2ksyGw1EhPNhu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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