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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b174f468b0d1f039b114f48352c8b60d7b63bd18b55c4a17f0adcb86fb01a755' 
  AND token = '38tKjXAruhL48WAr2d1hWwA9IMs0Q87A0b/mcqhiqws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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