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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1828f556eee1d1a4b159fba41c740b36a1d1cf083191f3249a3c276273791b' 
  AND token = 'STalOqKDXdh00lF3rP7D2p1XXue44U6sNo621Zj82g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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