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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5941391b6cc53df5de3703da10fd7d35f7e1539e1802727c709131cd4542b200' 
  AND token = 'DBa0kx4j5fQiy0iJyRfNRsP6IZIVz0J6pgmCA5H8fak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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