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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dacd32ae2f88fc92171dc9f1fb2c31bbe09e99da65d4560ac698d4c245571a6' 
  AND token = '2GKelS+MqWk9n0Q90PKBj5mIi6qNMD33LWW10sR3ubE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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