Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5147f52ac3ef7e46557d95ab592c34b7f77bd9d5d7272e9bd8cb1923a138f2f3' 
  AND token = 'tB51S6WvhssM+6lJjjXcsOjTDmfEb+93XFJqQ2sZ7tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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