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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6d0af037fecf57d12f818c4bb42529a4f51e5bf5028a3ba14c48a823947ee7' 
  AND token = 'WOl2Ei3GF2xVF8n7XiUXlKU36BAqsjh90sv6UbjruMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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