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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406919924e693c6bf4f04236a329c8cbdd703d653a4366cb9aff03c7e7d7df57' 
  AND token = '6uy+SXay5n5Dwu9LUuaonfUF7IjdOAuuYfENov5s/NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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