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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207beedda061fb0d5347e335dd2d7dba35dbba40621310fbabd0fabc6518f7b1' 
  AND token = 'FOAOusRAA50VKSIESy077HBeSLKe+l1g7CLUToT+9zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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