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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d4fdd458d098838366ab6ead3e753f89d452b216f85c621a58c973ddfc9ddd' 
  AND token = 'SjIA0WexxeOY6F8ZLfxm7b0W+arOGo2VKqWfwMcF4Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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