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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6706e371c66bf1ea40eaface8d7c8005aac410f7935dd7cc1f2c1f1a52ffddb' 
  AND token = 'uk63E0SCw+Q8uVnnsS1UpIVB+58P92IHMnyKFWlSvcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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