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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59af84facd4e200937e329c415bda5ed3923495e89154b67b49aa5566c8919c' 
  AND token = 'oXENO+1QCwnX6TCFM49q7g4S+hYxRP0q0aDZqXkHZUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.07957

JSON explain

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