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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983b34b80cdd38e50d68ff86d4b4d258b928bd739221ff9df1e63aa8dafe308c' 
  AND token = '/Tpm8LlKj19qFq7mAvj0CNZbM0jNsTtLkwOS1a83MFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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