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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa870eabd640160537a7ca9032e92802cf0eed4a80d8574f0463fdf6a940c35' 
  AND token = 'xv7UtIGG63BJrEIWM6e63RMgzpK5w2p/7CdTQ+7ChOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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