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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f053cf70c2ca2879cd7717510ddaea7cce852ad7624a8149c1808f8f97ad85' 
  AND token = 'FzFBxzs9uBhvqcHqWyoAuqa0OJGYHalyP7NZhLyogNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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