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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76506885ea9f3fb326d8862542c78614792cf2e674059132c8f913cc41bb8641' 
  AND token = 'ujBw7S7XuyBFES7BQI3IbN7Z1ZjiRLgP8Zh7hl4yGas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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