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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff9d958b3a7327e27d1c54d67e525c8b4688acc97013e16a4584adea72148b2' 
  AND token = '/W/fT06ex89nodWqRj/w9XxsAbhoBKJK///xZPV0h2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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