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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f4451abb4efac0d14f908bcf1e09676ce578975e6ff652312f30a6986b5f30' 
  AND token = 'iL+yt4uwrFBu8h0QYNhEJPbD2YeJnvsx+hRUJ+j9A5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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