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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7017e1bac1a8efd16e3c1e702aab87cf8e4763834d07ffa232f8ef78d7a1bd3' 
  AND token = 'fBqLPEaR0iZxWQMzQFwt6N9+K8aO9esJZIeiDTkt9/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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