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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ed9325481e0b267b16eefa3b9a36bcc16ce0aba7bd5d1af887503b3d7eee59e' 
  AND token = 'qgR2sZJ78qH8E00DFm/J7PwByyow0H6CFHC/1YvQLcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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