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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ebd0e1c0eb51ca128acda0a4f932dd133ea864a8b0a831baaf3d031f9d30bb' 
  AND token = 'w4Y1z1F75PXhr5XHGw7DYdLnm7ibychF+RXDHTmKH1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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