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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f394b1f4319054c803dc44f3b0ca1e2568a542eeb900f92a5d03580455305ab' 
  AND token = 'OWLiDhsFspokjnhRZjY5ttrpvvAgwcix+M5BSmSTa/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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