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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bcf3e0ea271ba8e853fc2f05bbb2fae0e55434062968a36e8f52e069bf88ebe' 
  AND token = 'Iws78gDKArCol5e4UzZcxtGU/raS19m8FoLkGIQfzlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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