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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac5d8a3fe41516a380297c06eb8bcc6bce9c909678c0147cdf90f3d7e2639dc' 
  AND token = 'VU/Ljuudrjjz8tqtqimdI6hyXTJM62vHi1rx+sAIyA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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