SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd2257f989d78430c137950f00480a8769e5961f3290961b6d8e40d87a1a6c7' 
  AND token = 'qBpBgnIbyGVuyJDej6zIM8+VFMcY0Z/lTsC1kdB0Ocg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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