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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02845aeebf31021445762177b9860b0ecc5a3cab9d7bcdb6ec5ba0f54ad59ed' 
  AND token = 'bRWmsZhieSJxoz2ydgSAXtcIGNT/ffoazjcW48Oq9wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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