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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4697742b5896f4ed3afdd23dadc4d26b4316e32aa1761ceedda085197d1ac448' 
  AND token = '4ia7fuTuxL7dg/jqC4Zlc+i8UpHXKS823RiUbyDjGt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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