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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bacc747aa9d7daee93f386e11a20a776005577749959e0fc3217828b0336afe8' 
  AND token = 'nv77EuQ6K+9vb2KcbnwT+B6fPi1pH81jlX0lxahR2a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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