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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ac9caf731432a9e248d5c36a789a2093972e896960bc6790c2b8af94d6b02d' 
  AND token = 'AdrcMmbymp3QsNqKSDOPqH69zjF/ru1d8mD+evKlzPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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