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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e1f7293658c8b5ea5933db68a407ad95e6f1e748a850000c2dbac14522f9ff' 
  AND token = 'e76ooCD5HHvtIL6mqejeNaTbfcc1TjWZtiukT8U4SPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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