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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e89a7f97dd9231bcae9c25b2bbaad08d862214c4fcfc4ed3354ba4ba914de44' 
  AND token = 'nBkba6JhXjr6Wwy9iHeIZSGn6frkmdoW2lUi+p8GR+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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