SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f0f501c4b1c3fb3db09724196fe7ee3eab3b265187cb1cf582fe743ea26a4a0' 
  AND token = 'rJ/XgVTp9n1mVwL+2fQDjBgmVndsEYY/ZlcpLmm/ViU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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