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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c94bb554694aafdfc02fdad34dd89e34e3deba0cd32e2e3c6fb702454c5c16' 
  AND token = '+zPI1IQ7T2bYpxw4toyJ19miBU1KoNHTfK1nn1mqojE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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