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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df0b77f2548ffb48e2e3ccda81cb32d1f15a938bda8bdf1845b73b4ba99cef2' 
  AND token = 'VtFgZBXklOgpLMfRqeal6rwIivgLhfSJ/ef9adZdsQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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