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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a70c2e7f95e22a364fbbbb2ce502bc17a57236d6427248fe18be862b8b298ed' 
  AND token = '9/a4U/7KoIurnX6mDbGI13R2zYY0yK05+cYGLhgM8qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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