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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77078f984f4498d9eea7aecc89adfeb57ee4bbf64390e9eab55dca9d849558b' 
  AND token = 'QEzRESIIvc2EuPtsTXl9OGytCMiD2DAd2rwnWdFq/l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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