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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f2f2a77cdaf0ff35583e6b36ece1d9413b03d702c761bac2e2241d6edf100e' 
  AND token = 'Cln4eXTTYcc8kmbEdDGhr/XopD5MRXUklf9JgHnYhGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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