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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97a2032d6a68441b3d449f54dcdb248879b84ea06174d6c3a5f91eb6a53ee91' 
  AND token = '3RSP4z1QXBfh2DnKc0kyr/h8XnvW+f/V1DOzU+bMVN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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