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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fe5244eae32dd691a9579642beeca52520ab2b5e13d08a7ef5f61e73d36d70' 
  AND token = '8EZ6fCRQDq8Jx/lgSo8DFgyxEFIV3LWso+RPQ48UVOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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