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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6de7231fee5f6dd9879b6faf3a6496c0f013ae1e75a111e266d55c78f792e4' 
  AND token = 'oZ493ydOgossxTR6gvqAbyXE7WAdEaOzMR627VayGIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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