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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2675d67c3cf848c01e2bef88958a52d58280ec567a638cb203bfae423731187f' 
  AND token = 'VICcnEA/Q7jmqJIHdvOjH7MMm0NlkONy7x3C0t/ZMGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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