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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff922466d9e12209f27eae52d5a513e9d84ddd759c71274f4e9c2b38dc884a9a' 
  AND token = 'Ue148mJgHe3PlWst0erhfhmIKadfROXBVpkGMBS2cOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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