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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beecbfa25cb56d99a57388c9510ced25662b89696fb8ddfcdffa4523e784bbcd' 
  AND token = '25eR5v3DvCSH5oltviJtG42gRFFWVh2monC6A31s7Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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