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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6ec0db1d41d96279af387ee0fca468f34c4ca115a7141ec340a43b17d2bd5a' 
  AND token = '2wCI/mbEiByJvaQa1MSKbJwaJDA0vbNl4mx6xZMw2dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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