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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f243f9956fba142adbd26496bb27fb083a8565673bb17a579ce8b5d9bfbb5e0' 
  AND token = 'A/XbtpWFUVJ7NQ0rKAKa0x3qV6YTWcz+lHYY94/tkW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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