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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b897733ae80bd8569cabc57a5abfea6506d92b2c2d183afbe15342674572c18' 
  AND token = 'RVZVmfmOEKiuSOOKp5GkSYdoYTfXRi4MH/sWpUE3Od0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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