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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9ce63467807750b0d6882f135a6f85381e1208d6143404f299211c10d48bb3' 
  AND token = 'Q9nPgFrna1G0Vd2FA522YSaQe4hRIsBztFyH7uHf3F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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