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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d1e698da485a2e23ae914369b117f1dc247aa7638d2ae1fe9e1315b8782008' 
  AND token = 'uGQf0eER8riO81BVYcQIlgGMQFSL8GrvtB62qVc0g6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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