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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78595853df42579fcdeb21d1afad12ed192af4fc929a562172322ffc6b96aee8' 
  AND token = 'wOosvWBAruNIg2CGSVpOeqNhrz8eUDCngsPG7ms8Jkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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