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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d0868b617605f200aa2d5a9a52f02af4520612cb0d0678f67dfebe0540eeca' 
  AND token = 'Xiou4gr7oI0ZrVJcmUvhzIuDwgxS3LdF1yhC892yzjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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