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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7cba273134c86edab75ec7a783d6704a4594efac41c3acee4aa565fa9c1e37' 
  AND token = 'sGjlHQD3Oku0DzFSdFN3SP0cEavs0SX9POU9bvqrOw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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