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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367895e85054e50cdd8761d43de52982d2df8d195f1618d453850812bb9d11a9' 
  AND token = 'kWkYny0ulFUSK5/ytA53i/ywc7Wyzckbwn/Rn4qtIu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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