Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855157ca1d93d7cfed10218e4c66d746db495e0ac3e7c2c6c1c0c358a6247c4e' 
  AND token = 'UdlANbbpkuwExvFHj3DTQyD0nE2ASDlth2py+ox4dM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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