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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea278678b02cb4b0674c1305cdc2733e6f1f3414ba2869ba8dfb2131ebf6df9' 
  AND token = '1UxIpg8uBbM7eLx+fFtk7KucPtj2XhlI5xIk0JJ4dA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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