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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170bdf442c7ffd8f7c48ac43c5c3001eb74509869e135c065189c1702575099c' 
  AND token = 'm6v4ge8SmYuPIVwrkzhXJch2tWM6I0bdbm/ZlTSBpFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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