SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9059e6f62df417f56c8dd412f1d3b6b5eb0d82a8fe7afbd053b6444afe90ef4e' 
  AND token = 'rVQ4JjlROqBfqxDxKiGahEimS9pF0Kh6zEVzPFYe/DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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