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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bafdd564112b27f7713ebbfe5cbda61d646e8f618ef79a388ff2d74a5098f1' 
  AND token = 'De1sOld8oqqsE1I6rVXqzpkYQ/73Fe9f7gFaY+yTD0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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