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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e3412e269187445ad79f0eecb51eb10023d12c0939fd552fced0e074aeb276' 
  AND token = '6F90CgxaX8aZrod/GoFnvfXoRrCM6iV5LUqa3hWAWRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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