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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352f24346de2eabd273b45c8bda8fa4f8e83e63672673153bcc0207b91d40ddf' 
  AND token = 'LYHwUNQA9wmO1s5jN0DrmKDjTECeq1bSeZ3eY0ph1hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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