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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49f98e8e24747ca31c2cfb0b0e35029cbb0630fbf6c9c73c7ab7c160c7efb66a' 
  AND token = 'r4addT9w99DlCW6Ou4whQ36zPZuzKYmbFNg9Swy4iZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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