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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e29bf43e8b368ab575b3ca31aea318935cb18af62ff7bd5123afbe9e4bc0e5c2' 
  AND token = '4PNFUKPPj4a80awfqjXbhW1w4oNURn8XH6C/sBdPADM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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