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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb7abe954f8a4fb9a5ba0fe5328601c89eb1ae0fb6afaccf8db8305eba86158' 
  AND token = '/ByYHpdRIYzP7ahY/tb4hOsinAvh+90EOVDtN1NvldE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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