Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cebee1f62b4f7abb52dba644feab83935cf3b51e3de9991bf7ff2a922eedb1' 
  AND token = 'l8DZ5TOGv2CUWMoSaoYJ1fKhsaPzhBfgHQz5uttt0j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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