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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b0a3af98cb9f95fe40ead74c3a8ca929f0f16953ba79ae4bd056d8fd4b72bb' 
  AND token = 'rr7XLnXUgR9WPHc0uacnvrJbp+nfq3uIGeceCDihyXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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