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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc7794a581393a678042773835fd5533fc8fb48daff646958a096fa774815d8' 
  AND token = '1lobc/a1tzgbEnvTN8f4L929+5OsOLo3hvsyZlcRSkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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