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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9dee34acdaf26aae5ac358e3d937fcf7cde758487ea846ab7fbe0231b41f87d' 
  AND token = '1//yMzAXO+mRjHwLdNBug2QA/5cXA17fw9Gb2SdDwcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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