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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2d42ae1967d6558f6e54c7b01dd72fe926123c3130f0d8f9d00d3cb4933abd' 
  AND token = 'bK8a/ypf7C8mUQW198Tx2stJQ7x0yrJ/2yE3U+QjbPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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