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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2c6eb3e33135912948cb2f1a241b5ddcd32da6c6d412a0ec5108de007341cc' 
  AND token = '3xVqpHroqg7aiCtZtePS7QDcbu4VmM3nf3sGYE9fbA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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