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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc8a03eaa0551c8c36d08d7bb3c4fe164e2cb7d8f380b7c82663963c79a1fa2' 
  AND token = 'kVYCzlDC66Qi19EqdCFteiGQIQco+KHbHdl8Bj12bTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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