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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcd4445f5180f1072d5d893180595e74b1b4dad0abca81c08a3e899f56af4ea' 
  AND token = 'Srn2c6bG851o54boG7WDvzBghVbb7KJombqgIxMWqzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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